AK7755EN_16 Datasheet, PDF (70/109 Pages) Asahi Kasei Microsystems – DSP with Mono ADC Stereo CODEC + Mic/Lineout Amp

[AK7755]
5-2. Read Sequence1 (with PRAM, CRAM, OFREG addresses)
CSN
SI
COMMAND ADDRESS1
ADDRESS2
don’tcare
(L/H)
COMMAND ADDRESS1
SO
COMMAND ADDRESS1 READ DATA
READ DATA
Hi-Z or Low
COMMAND
Figure 51. Read Sequence1 in Echo-Back Mode (SPI)
Data of the address2 field is not echoed back in read operation. The read data on the SO pin is output
after writing to the address2 field.
5-3. Read Sequence2 (No Register address）
CSN
SI
don’tcare
COMMAND ^(L/H)
don’tcare
COMMAND ^(L/H)
SO
READ DATA
Hi-Z or Low
READ DATA
Figure 52. Read Sequence2 in Echo Back Mode (SPI)
Data output has priority in read sequence.
Hi-Z or Low
6. Format
6-1. Write Operation during System Reset
1. Program RAM (PRAM) Write (during system reset)
Field
Write data
(1) COMMAND Code 0xB8
(2) ADDRESS1
00000000
(3) ADDRESS2
00000000
(4) DATA1
0 0 0 0 D35 D34 D33 D32
(5) DATA2
D31~D24
(6) DATA3
D23~D16
(7) DATA4
D15~D8
(8) DATA5
D7~D0
Five bytes of data may be written continuously for each address.
2. Coefficient RAM (CRAM) Write (during system reset)
Field
Write data
(1) COMMAND Code 0xB4
(2) ADDRESS1
0 0 0 0 0 A10 A9 A8
(3) ADDRESS2
A7 A6 A5 A4 A3 A2 A1 A0
(4) DATA1
D23~D16
(5) DATA2
D15~D8
(6) DATA3
D7~D0
Three bytes of data may be written continuously for each address.
014006643-E-00
- 70 -
2014/10